Carbureter.



J. 'A. DAVIS.

OARBURETER.

APPLICATION FILED 0GT.21,1012,

Patented Mar. 24, 1914. 2 SHBETSSHEET 1.

FITNESS ES:

J. A. DAVIS.

CARBURETER.

APPLICATION FILED OOT.21,1912.

Patented M21124, 1914 2 SHEETSSHEET 2.

IN V PINTO l\' Jafizz (I, 242K219.

VI TXESSES:

airs arnn' uric JOHN AMBROSE DAVIS, OF NACO, ARIZONA, ASSIGNOR OF ONE-FOURTH TO M. R.

MILLER, OF NACO, ARIZONA, ONE-FOURTH TO J. M. MILLER, OF VACAVILLE, CALI- FORNIA, AND ONE-FOURTH TO TRAYHARNE DAVIS, OF OAILLAND, CALIFORNIA.

CARBURETER.

Specification of Letters Patent.

Patented Mar. 24, 1914.

Application filed October 21, 1912. Serial Ito 726,852.

To all whom it may concern.

Be it known that 1, JOHN A. DAVIS, a citizen of the United States, residing at Naco int-he county of Cochise and State of Arizona, have invented new and useful Improvements in Carburetors, of which the following is a specification.

This invention relates to carbureters. and particularly to that type known as spray carburetors.

The object of the present invention is to provide a simple... compact and elficient carbureter, so constructed that rapid vaporization and greater homogeneity of the final mixture will be produced.

Another object of the invention is to provide simple outside adjusting means by which the carbureter may be adjusted for various speeds to secure perfect ignition and steady running. The invention consists in certain novel constructions, combinations and arrangements of parts, all of which will be hereinafter more particularly set forth and described in the following specification and drawings, in which Figure 1 is a vertical, longitudinal section of the outs1de casing partly broken away. Fig. 2 1s a cross section on line X--X, Fig. 1. Fig. 3 is a perspective view of the throttle valve head. Fig. e is a perspective view of the throttle valve tube. Fig. 5 is a longitudinal, central. vertical section. Fig. 6 is a perspective view of the gasolene valve adjusting means. Fig. '2' is a perspective view of the air-valve spring tension adjusting means. Fig. 8 is a fragmentary view showing the gasolene level adjusting means. Fig. 9 IS a detail view showing the position of stop 13.

In the accompanying drawings A indicates the float valve or receiving chamber which is provided with a central inlet valve 2, automatically controlled by a float 3 connected to the inlet valve 2 by the usual connecting links and levers 4.

. p The carbureting tube 7 is provided with a lug 10, so positioned on the tube as to register with a thread or groove 11, formed in the lower portion of the sleeve 8. The tube is also provided with a stop 12 which ongages with a shoulder 13, formed on the sleeve 8 for the purpose of preventing the lug 10 from passing out of engagement with the thread portion 11. The operation of the stop 12 and the shoulder 13 is further explained by referring to Figs. 1 and 4 which show the sleeveS as being provided with a shoulder with which the pin 12 engages to prevent the lug 10 from passing out of engagement with the thread portion 11; the pin being free to move in the opposite direction when the tube is turned to the upper position as the sleeve is sufliciently cut away .to prevent a free return movement of the pin 12. The upward movement of the tube is limited by the length of the thread portion 11 when the lug 10 reaches the end of the thread. The upper end of the tube is provided with slots 13 engageable with lugs 14; forming part of a throttle valve 15; A portion of the throttle valve 15 projects through the wall of the mixture chamber 5 and is provided with a square portion 16, upon which issecured a throttle valve lever 17. The lugs letforming a part of the throttle valve are provided with an annular ring 18 for the purpose of holding and guiding the tubei'.

The position of the tube 7, with relation to the head portion of the throttle valve, may be adjusted by turning the throttle valve lever 17 in one direction orthe other whichever the case may be. The turning of the lever 17 in the direction of arrow 6 will cause the lug 10 to climb up the thread portionll and force the tube up against the upper portion of the throttle valve head, thus decreasing the port area or discharge opening of the throttle valve when it is desired to out down the mixture. Motion'to turn the tube is transmitted through the throttle valve head and lugs 14 which engage with the slots 13 in the tube.

One of the important advantages of this invention is the construction of the spray nozzle for the purpose of discharging gasolene in as finely divided a state as possible.

In any one carbureter the perfection of vaporization is proportioned to the fineness with which the liquid is broken up at the what causes the'above factor of fineness ofdivision to enten Tl ius it is readily seen that the finer the'fu'el division at the nozzle, the more ra id and complete will be the vaporization and the greater the homogeneity of the final mixture. The spray nozzle 19 here shown, is constructed with this ob ect in view and" is provided with a puppet valve 20, the hit of which is controlled by a threaded adjustable stop 21. The position of the stop :21 may be controlled by the thumb wheel 22, which is provided with a rod 23 extending through the center of the 'carbureter. This is provided with a square portion '24 atfits lower end which registers with 'simil'afsocket portion 25 in the head of the -adjustable stop 2l,'thus making it possible'to regulate and adjust the position of the stop from thefiutside.

During. operation, air is admitted to the ca'rbureter through a suitable number of perforations 26. These perforations or open tings 26 are formed in the cover 9 and are normally closed by a'spring seated valve 27. The air when entering through the openings 26 follows the path indicated by the arrows 0 and reaches the main chamber through the mixture tube 7, this causing the air to concentrate and rush by the spray nozzle tip 19. The passage of air at this point forms sufficient vacuum to raise the valve 20 and admit thegasolene. The puppet valve is provided with a flat head which breaks. the jet ofthe discharging gasolene and forces it out," radially in all directions in the form of a fine spray. The amount of gasolene admitted-at this-point is controlled by the position of the adjustable stop 21, or in other words, by the lift of the valve 20; the stem i of the valve being tap-ered or otherwise than at high speed,this being due tow the formed to admit more or less gasolene in proportion to the lift of the valve.

The quantity-of mixture that an engine will take varies greatly Withthe speed. At low speeds the mixture should be richer 'fact that'at low speeds more heatis lost through the cyl nder walls and also considerable compression is lost byleakage. At

high speeds the compression is higher, due to less leakage and less loss of heat. Therefore, unless the mixture be leaner at high speed, there might be danger of pre-ignition.

With this object in view I have providedmeans for creating more or less spring tension :on the air valve 27. This means con- -sired adjustment has been made.

throttle valve head is threaded to receive the rod 31; the rod 31 being rovided with an and lower therod '31 within the carburetor,

which in turnl'will lift the strap and springsupporting disk 30, thus causing more or less tension upon the sprmg. From this 1t in any suitable a a adjusting screw t will be posslble to raise 7 can be seen that when the engine s running at low speeds, the amount of air passing through the. carbureter will be much less than at higher speeds. The spring being adjusted to a certain tension will only allow a certain proportion of air to pass the valve,

which proportion is determined to give the best results at normal speed.

" By the construction here shown a simple and compact carbureter is produced in which the float is arranged concentrically with the spraynozzle. This construction eliminates disturbanceof the fuel level, withrespect to the nozzle, which otherwise would be caused by any" inclination of the car.

Another advantage accomplished by this construction is".the position of the spray nozzle with relation to the passage of air through the carbureter, giving it an oppor tunity to produce ,the highest-efliciency and best results. The discharging from ixture after'passing and ghhe upper. end of the.

throttle valve tubepasses in the direction of the arrows d, striking thejup-per portion of the mixture chamber where it is deflected and given'a swirling motion before passing out of the discharge opening 34. For the purpose of adjusting the spray nozzle with relation to the gasolene level within the float chamber, or vice versa, I have provided means for raising or lowering the air inlet chamber within the float chamber. This is accomplished'byj'provid ing slanting slots 36 in the float chamber and screws 37 by which the air chamber may be locked to the float chamber when the de- I The carbureter is neat in appearance, sini- 'ple and compact in construction, and may be easily adjusted and controlled by the means positioned outside of the casing. The materials and finishof the several parts are judgment of the.

such as experience and manufacturer may dictate.

- I wish it understood that various changes.

in form, proportions and minor details of construction may be resorted .to within the scope of the appended claims, and that I do not wish to limit myself to the specific design and construction here shown.

Having thus described my invention, what I claim and desire to secure by Letters Patent isj 1. A carbureter comprising a mixture chamber, a valve-controlled air inlet chamber, a float chamber surrounding the air inlet chamber, a throttle valve in the mixture chamber having a plurality of ports, a carburcting tube connecting the throttle valve with the air inlet chamber, means for adjusting said tube with relation to the ports in the throttle valve to increase or decrease the port area, a vertically disposed, automatically controlled fuel inlet valve in the float chamber, a vertical spray nozzle c011- necting the float chamber with the air inlet chamber centrally positioned with relation to the float in the float chamber and with relation to the carbureting tube, a valve mounted in the spray nozzle to control the discharge of fuel from the nozzle, and means for controlling the lift of the valve.

2. A carbureter comprising a. mixture chamber, an air inlet chamber, a plurality of ports through which the air is admitted, a spring-actuated valve closing said ports, means for'adjusting the tension of said spring-actuated valve, a float chamber surrounding the air inlet chamber, a throttle valve in the mixture chamber having a plurality of ports, a carbureting tube connecting the throttle valve withthe air inlet chamber, means for adjusting said tube with relation to the ports in the throttle valve to increase or decrease the port area, a verticallydisposed, automatically controlled fuel inlet valve in the float chamber, a vertical spray nozzle connecting the float chamber with the air inlet chamber centrally positioned with relation to the float in the float chamber and with relation to the carbureting tube, a valve mounted in the spray nozzle to control the discharge of fuel from the nozzle, and means for controlling the lift of the valve.

3. A carbureter comprising a mixture chamber, an air inlet chamber, a plurality of ports through which the air is admitted, a spring-actuated valve closing said ports,

'means for adjusting the tension of said spring-actuated valve, a float chamber surrounding the alr inlet chamber, a throttle valve in the mixture chamber having a plurality of ports, a carbureting tube connecting the throttle valve with the air inlet chamber, means for adjusting said tube with relation to the ports in the throttle Valve to increase or decrease the port area, a vertically disposed, automatically controlled fuel lnlet valve 1n the float chamber, a vertical spray nozzle connecting the float chamber with the air inlet chamber centrally positioned with relation to the float in the float chamber, and with relation to the carbureting tube, a puppet valve mounted in the spray nozzle, a deflector head on said valve, and means for regulating the lift of the valve to control the amount of fuel dis- 4. A carbureter comprising a mixture chamber, an air inlet chamber, a plurality of ports through which the air is admitted,

a spring-actuated valve closing said ports,

means for adjusting the tension of said spring-actuated valve, a float chamber surrounding the air inlet chamber, a throttle valve in the mixture chamber having a plurality of ports, a carbureting tube connect-.

ing the throttle valve with the air inlet chamber, means for adjusting said tube with relation to the ports in the throttle valve to increase or decrease the port area, a vertically disposed, automatically controlled fuel inlet valve in the float chamber, a vertical spray nozzle connecting the float chamber with the air inlet chamber centrally positioned with relation to the float in the float chamber, and with relation to the carbureting tube, a puppet valve mounted in the spray nozzle, a deflector head on said valve, means for regulating the lift of the valve to control the fuel discharge, said means comable from the outside of the carbureter for controlling the position of said stop.

5. A carbureter comprising a mixture chamber, an air inlet chamber, a plurality of ports connecting the air inlet chamber with the outside atmosphere, at spring-actuated valve to close said ports, means for adjusting the tension of the valve spring, said means comprising a washer upon which said valve spring is carried, a strap having an annular collar upon which the washer is mounted, a hollow threaded rod having a collar by which the strap is hung, a wheel for turning said rod, a float chamber surrounding the air inlet chamber, a throttle valve in the mixture chamber having a plurality of ports, a carbureting tube connecting the throttle valve with the air inlet chamber, means for adjusting the position prising an adjustable stop, and means operof said tube with relation to the ports in the valve, means for regulating the lift of the j v valve to control the fuel discharge, said means comprising an adjustable stop, and means for controlling the position of said stop. i

6. A carbureter comprising a mixture chamber, an air inlet chamber, a plurality of ports connecting the air inlet chamber with the outside atmosphere, 9. spring-actuated valve to close sald ports, means for adjusting the tensionof the valve spring, said means comprising a Washer upon which said spring ischamber having a plurality of ports, a car- .bureting tube connecting the throttle valve.

with the air inlet chamber, means for adjusting the positionof said tubewith relation to the ports in the throttle valve to increase or .decrease the port area, a vertically disposed, automatically controlled fuel inlet valve in the float chamber, a vertical spray nozzle connecting the float chamber with the noeneae tion ofsaid stop, and means independent of the float valve for adjustingthe gasolene level with relation to the spray nozzle.

In testimony whereof I have hereunto set my hand in the presence of-two subscribing witnesses.

JOHN AMBROSE DAVIS. Witnesses:

GEO. Joy, Aenns C. Domneunz.

Copies of thispatent may be obtainedior five cents each, by addressing the Commissioner of Patents, I

' Washington, D. G. 

